JavAPRSFilter Users Guide Ver 3.1 by Roger Bille. NOTE: This is the JavAPRS Filter Guide from F5VAG's website, with some minor additions, redone with HTML formatting to make it more readable and easily searched.
A small program to automate the construction of the command lines below, APRS Filter Wizard, is downloadable from: . This freeware program prompts you to fill in the blanks to construct a command line you can then copy/paste into your APRS programs "Extra log-in text" field. Introduction: The APRS Internet System full feed today has a lot of traffic (a continuous 50-100K/second) and and can require a high bandwidth connection to an APRS-IS server.
Addon Miscellaneous. Connecting to APRS-IS. To establish a connection to APRS-IS, establish a TCP connection to a port on an APRS-IS server that provides the type of feed you desire.
If your client software is bidirectional (sends and receives), turn off the Nagel algorithm when connecting to APRS-IS as it can introduce significant delays (TCP_NODELAY). All core servers support port 10152 as a full feed port. Use this feed judiciously as the packets per second and the overall bandwidth requirements will quickly overrun most APRS clients and may overrun your ISP's capabilities. Most servers support the HTML status port of 14501 which can be used to inform you of other ports available on that server. AVRS. Universal Connectivity-by-callsign Workshop: This workshop was held 18 Sept 2011 at the ARRL/TAPR Digital Communications Conference and WOW!
Was it an exciting event. AVRS, however, is just part of the overall Ham Radio Initiative for Universal Contact by-callsign Follow other links there. APRS: Automatic Packet Reporting System.